Adds support for enabling new stager use by user email as well as by
percent.
Test plan:
- New unit test
- Enabled for my email addr, verified that I was using the new stager.
Ran BVTs, verified they were not using the new stager.
- Ran BVTs on my deployment
Change-Id: I4c1e55c1d7fb33e608a0626db34c4b49695fa147

This adds counts for the number of pending tasks (tasks waiting to be processed)
as well as the number of active tasks (tasks currently running).
Test plan:
- New unit test
- Pushed N apps in parallel, watched varz counts
Change-Id: Iadc991528a97f9d50a544ab8f05b6efff8a533bc

This keeps the new stager behavior in line with the old staging behavior.
We explicitly stop the app, instead of starting a single broken instance and
relying on the HM flapping logic to kick in.
Test plan:
- BVTs pass locally
- BVTs pass on deployment
Change-Id: I715d5ef6df3ddb027baa6dad4437d207cf9f8777

- Rewrite stager to use NATS queue groups instead of Resque.
- Add support for staging uploads to nginx config
- Integrate CC with stager
- Add support to bin/vcap for controlling stager/redis instance
Test plan:
* Ran BVTs locally with and w/out the new stager, and with and w/out nginx support.
* Ran BVTs against my deployment with and without the new stager.
* Ran unit tests for stager and CC.
Change-Id: I3c85d7de58f518d6111ca3dbf6c55fc532350d9d

Includes the addition of a global cloud controller route,
`/info/runtimes', which responds with all runtime information from the
DEAs. Also includes some renovations for how we store app metadata.
Change-Id: I11b076b6c53b962acfa58407b7ebe857060bb08a

In addtion this change also includes the following changes.
o Remove all backup service related scripts/templates.
o Simple fix to change the deployment name for mulithost mongodb deployment.
Testing Done: verified single host deployment, checked presence of log files in
the new location.
Change-Id: I2b96246da62fe44a3e7de5ca86ca0bf49a20b9c3

Also bumped up the verision of rubygems and bundler.
Testing Done: tested single host setup. Will test multihost setup before
submitting the change.
Change-Id: Ib7ab913f5bf27e90962b5bade2a9b9a7b51cecfd